A Novel Method for Rigorously Analyzing Beam Loading Effect Based on the Macro-Particle Model

The beam loading effect is a considerable issue for a high average current beam. We apply a novel method without utilizing the specious beam current value to rigorously analyze the beam loading effect in S-band linacs. By tracking every macro-particle＇s state and using the energy conservation law, p...

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Published inChinese physics letters Vol. 31; no. 1; pp. 65 - 68
Main Author 陈曲珊 裴元吉 胡桐宁 秦斌
Format Journal Article
LanguageEnglish
Published 2014
Subjects
Algorithms
Beam currents
Constants
Dissipation
Energy conservation law
Equivalence
Mathematical models
Tracking
宏观
束流
直线加速器
粒子模型
能量守恒定律
荷载效应
负载效应
迭代算法
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/31/1/012902

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Summary:The beam loading effect is a considerable issue for a high average current beam. We apply a novel method without utilizing the specious beam current value to rigorously analyze the beam loading effect in S-band linacs. By tracking every macro-particle＇s state and using the energy conservation law, power dissipated from the beam is calculated in each cell. In the new particle-based algorithm, the concept of equivalent beam current is proposed. Its value is not constant and it has a small variation through the accelerating structure. Also, we introduce the iteration algorithm as comparison and we find that the two algorithms coincide with each other very well.
Bibliography:The beam loading effect is a considerable issue for a high average current beam. We apply a novel method without utilizing the specious beam current value to rigorously analyze the beam loading effect in S-band linacs. By tracking every macro-particle＇s state and using the energy conservation law, power dissipated from the beam is calculated in each cell. In the new particle-based algorithm, the concept of equivalent beam current is proposed. Its value is not constant and it has a small variation through the accelerating structure. Also, we introduce the iteration algorithm as comparison and we find that the two algorithms coincide with each other very well.
11-1959/O4
CHEN Qu-Shan, PEI Yuan-Ji, HU Tong-Ning, QIN Bin（ 1 State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 2National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026）
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/31/1/012902